Operating mechanism for ore-concentrating tables



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OPERATING MECHANISM FOR ORE CONQENTRATING TABLES. APPLICATION FILED JUNE 19, 1919;

1,361,674. Patented Dec. 7,1920.

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awuwwoz UNITED STATES SAMUEL H. B OYLAN, OF J OPLIN, MISSOURI.

OPERATING MECHANISM FOR ORE-GONCENTRATING TABLES.

Specification of Letters Patent.

Patented Dec. 7', 1920.

Application filed June 19, 1919. Serial No. 305,259.

To aZZ whom it may concern.

Be it known that I, SAMUEL H. BOYLAN, a citizen of the United States, residing at Joplin, in the county of Jasper and State of Missouri, have invented certain new and useful improvements in Operating Mechanism for Ore- Concentrating Tables, of which the following is a specification.

My invention relates to improvements in operating mechanism for ore concentrating tables, and more particularly to means for applying to the table a differential reciprocatory longitudinal movement.

In the separation of ores by this process, the pulp is fed upon the table and submitted to a differential motion which motion tends to advance the concentrates from one end of the table to the other where the finished product is discharged. If the forward and rearward movements of the table and the turning points of the motion are exactly duplicated no separation of the ore from the gangue will be made, the mineral simply oscillating back and forth until a majority of it is lost with the gangue.

To overcome this objection various mechanisms have been evolved to apply a differential motion to the table. However, it has been found that in the majority of these devices the table is given pronounced bump or jerk which has a tendency to advance the ore along the table before it has been freed from the gangue resulting in an inferior product.

T he object of the present invention is the provision of a mechanism to modify the reciprocatory motion imparted to the table by producing what is shown by an indicator as a round turn at the termination of the rearward movement thereof and the sharp turn at the termination of the forward movement thereto, the sharpness of the turning point at the termination of the forward movement being accentuated.

A further object is to provide a mechanism that will impart the forward and rearward movement to the deck of a concentrating table that will thoroughly and quickly separate the mineral values from the gangue and stratify the mineral values according to their specific gravity, and causing the products of value to be quickly advanced toward the discharge end of the deck.

A still further object is to provide a simple and durable mechanism for this purpose, parts of etch are readily interchangeable and which may be constructed at a cost below any of the present mechanism.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification, and in which like numerals are employed to designate like parts throughout the same:

Figure 1 is a side elevation of my device;

Fig. 2 is a plan view thereof;

Fig. 3 is a longitudinal section thereof; and

Fig. 4 is an end elevation.

Referring now more particularly to the drawings, 1 indicates a frame in which is slidably mounted a yoke 2. The yoke is supported for sliding movement by cross heads 3 engaging the journals or n ice a Secured to the yoke and depending therefrom is a member 5 having formed thereon a seat 5 adapted to receive one end of a compression spring 9, the other end of the compression spring 9 being supported by a similar seat 8 arranged for adjustment beneath the frame, the adjustment of the seat being secured by means of a set screw 6 eX- tending through a portion 7 of the frame 1. This spring has a tendency to hold the yoke normally in what will be termed the forward position.

Mounted in brackets 10 upon a pivot 11 is a lever 12 having an upper end 13 curved for a purpose hereinafter described and the lower end is provided with serrations or notches 14L. Mounted in the socket formed in the yoke is a removable head 16 having formed therein a socket 1'? aoapted to receive one end of a thrust transmitting bar 18 the opposite end of which engages in any of the notches 14.

A shaft 19 mounted in journals 20 is provided with a crank 21 which has mounted thereon a split sleeve 22 which is engaged by the upper end of the lever 12. It will be seen that rotation of the shaft 19 by any means will cause the yoke to be driven rear- Wardly against the action of the spring 9. Secured to the frame 1, as at 24, is a mem ber 23 having secured thereto a socket 25. Mounted for limited reciprocatory movement within the socket is a screw 2&, the movement thereof being limited by means of a pin 27 operating in the slot 28 formed in the screw. Mounted upon the outer end of the screw 26 is a disk 29 having threaded engagement with the screw. Between this disk and the member 23 is disposed a compression spring 30.

The operation of my device is as follows:

As the shaft 19 is rotated the yoke 2 is forced rearwardly compressing the spring 9. As the crank moves past center the spring causes return movement of the yoke. This return movement is limited or interrupted by the action of the spring 30, causing a check in the return of the yoke. This check is not abrupt but a retarding yielding stop and accomplishes a two-fold purpose. As the spring contacts the yoke checking this movement, the mineral advancing on the table deck by the momentum obtained by the prior forward movement and retarding of the forward movement for the extent gives the loose roller on the crank an opportunity to catch the arm or lever for a sharp rearward jerk which sends the min eral forward again. Thus as previously stated'at the termination of the forward movement the sharpness of the turning point is twice accentuated. To secure the operating mechanism to the table, any suit able means, as at 31, may be supplied.

It will be observed by an inspection of the operative parts of my device that the effect and purpose of spring 9 is two fold in that it not only imparts the forward movement to the yoke 2, but its expansive force has an influence on every working part of the mechanism, holding each in its place and taking up lost motion from wear in toggle seats, lever and lever bearings, and

crank shaft bearings.

It will be noted that the several parts of the machine are readily interchangeable and detachable through various arrangements. By shifting the toggle in the notches the length of reciprocatory motion may be varied. The tension of the forward motion may be varied by the screws 6 as also may the tension of the checking spring 30.

It will be obvious to those familiar with the art many minor changes could be made without departing from the spirit of the invention and I accordingly do not limit myself to the construction shown and described.

Having thus described my invention, what I claim is:

In a device of the type described, a yoke mounted for reciprocation, a crank shaft rotatably mounted above said yoke, a lever pivoted intermediate its ends and having one end extending adjacent the crank of said shaft to be engaged thereby, means connecting said lever and yoke whereby the yoke is shifted in one direction, a spring to 'return the yoke to normal position, and a second spring adapted to check the motion A V of said yoke and lever immediately prior to the completion of the return stroke to permit engagement of said lever by said yoke for the purpose described. In testimony whereof I affix my signature in presence of two witnesses.

SAMUEL H. BOYLAN. WVitnesses:

G. W. ROBBINS, W. R. SHANKLIN. 

